Mechanical movement.



T. J. HAMMONS.

MECHANICAL MOVEMENT. APPLIOATION FILED AUG. 21, 190s.

994,745, Patented June 13, 1911.

Inventor u J" Attorneys iinrrnn sTATns PATENT orrion THEODORE J.HAMMONS, OF BRONSON, KANSAS.

MECHANICAL MOVEMENT.

saar-i5.

T o all whom it may concern:

Be it known that I, Ti-inononn J. HAM- MoNs, a citizen of the UnitedStates, residing at Bronson, in the county of Bourbon and State ofKansas, have invented a new and useful Mechanical Movement, of which thefollowing is a specification.

This invention relates to machine elements, and more especially to pawlsand ratchets; and its object is to produce a mechanical movement whichis as nearly noiseless as possible.

To this end it consists in the use of a ratchet having undercut teethand of a pawl whose tip is yieldingly supported and whose body iscovered by a hood.

In the accompanying drawings, like characters of reference indicate likeparts in the several views, and :#Figure 1 is a side elevation of myimproved device partly broken away. Fig. 2 is a top plan view of theimproved device referred to in Fig. 1. Fig. 3 is a detail view of one ofthe operating pawls and the casing or hood therefor.

In the drawings 19 designates a framework upon which is mounted a pairo-f bearings 20 supporting a shaft 21. Mounted on the shaft 21 andsecurely keyed thereto is a main gear 22 which may be either a toothedor friction gear as desired. Also secured to said shaft are ratchetwheels 23 and 2a provided with deep undercut teeth as indicated at 25.These wheels are so mounted on the shaft that the teeth of one of thewheels will lie intermediate the teeth of the other wheel, said teethbeing thus alternated. Mounted for oscillation on the shaft 21 are apair of arms 26 and 26', each of which is provided at its outer end witha casing or hood 27 wherein is pivotally mounted a pawl 28 adapted toco-act with the teeth 25 of one of the ratchets 23 and 24. The casingsor hoods 27 are provided with springs 29 located beneath and supportingthe pawls 28 so gently that the end of the pawl may drop beneath theouter edge of the tooth 25 when in position to engage Specicaton ofLetters Patent.

Application led August 21, 1908.

therewith. By reason of this spring sup- Patented June 13, 1911.

Serial No. 449,709.

port 29 the pawl is prevented from violently dropping into the lower endof the tooth and making a disagreeable clicking noise. Vhen, however,the arm is carried forward the pawl is forced downward against thetension of the spring and into engagement with the ratchet by means ofthe undercut portion of the tooth, thus constituting a silent ratchet.Upon the rear end of the frame 19 is a standard 30 whereon is mounted apair of sheaves 31. A tension member 32 is attached at each end to thearms 26 and 26', and passes over the sheaves 31. By means of thisconstruction when the arm 26 is moved forward the arm 26 is movedbackward by the action of the tension member 32, and when the arm 26 ismoved forward the arm 26 will, in like manner, be moved backward. Thistension member 32 is preferably in the form of a wire, a chain, or thelike.

Connected with the arms 26 and 26 are tension members 35 which lead to asuitable source of reciprocating energy not necessary to illustrateherein, and it is intended that these members should be drawn uponalternately and toequal extent so that the arms will swing throughcorresponding arcs and the pawls carried thereby will be caused toalternately engage the ratchet wheels 23 and 24 and rotate t-he same.Reciprocating motion is thus converted into rotary motion and the maingear 22 may mesh with a smaller gear 39 on a shaft 38 journaled in theframework, which shaft may carry pulleys 40 from which the rotary motioncan be delivered to any suitable machine.

What is claimed as new is:

In the mechanical movement, the combination with a shaft, two ratchetwheels fast thereon having alternately disposed teeth with deep undercutfaces, arms loose on the shaft adjacent said wheels, and means forswinging the arms alternately; of a hood carried at the outer end ofeach arm, a pawl pivoted within the hood, and a spring fixed within thehood and supporting the tip of the pawl with proper yielding force Intestimony that I claim the foregoing to permit it to drop over the outeredge of as my own, I have hereto aiiXed my signa` each tooth when itsarm is retracted but ture in the presence of two Witnesses.

with sufficient resiliency to permit the paWl THEODORE J. HAMMONS. totravel down the undercut face of the I/Vitnesses:

tooth when the arm is moved in the oppo- WVM. CAMPBELL,

site direction. FRED A. LEER.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. G.

